<template>
    <div class="upload-box">
        <el-upload
            ref="uploadImage"
            v-model:file-list="_fileList"
            action="#"
            list-type="picture-card"
            :class="['upload', self_disabled ? 'disabled' : '', drag ? 'no-border' : '']"
            :multiple="true"
            :disabled="self_disabled"
            :limit="limit"
            :http-request="handleHttpUpload"
            :before-upload="beforeUpload"
            :on-exceed="handleExceed"
            :on-success="uploadSuccess"
            :on-error="uploadError"
            :drag="drag"
            :accept="fileType.join(',')"
        >
            <div class="upload-empty">
                <slot name="empty">
                    <el-icon><Plus /></el-icon>
                </slot>
            </div>
            <template #file="{ file }">
                <img :src="file.url" class="upload-image img-cropper" :alt="file.name" :id="file.uid"  />
                <div class="upload-handle" @click.stop>

                    <div v-if="!self_disabled" class="handle-icon" @click="openDialog(file)">
                        <el-icon><Delete /></el-icon>
                        <span>裁剪</span>
                    </div>
                    <div class="handle-icon" @click="handlePictureCardPreview(file)">
                        <el-icon><ZoomIn /></el-icon>
                        <span>查看</span>
                    </div>
                    <div v-if="!self_disabled" class="handle-icon" @click="handleRemove(file)">
                        <el-icon><Delete /></el-icon>
                        <span>删除</span>
                    </div>
                </div>
            </template>
        </el-upload>
        <div class="el-upload__tip">
            <slot name="tip"></slot>
        </div>
        <el-image-viewer v-if="imgViewVisible" :url-list="[viewImageUrl]" @close="imgViewVisible = false" />

        <!--  图片裁剪  -->
        <el-dialog :title="state.dialogTitle" :width="state.dialogWidth" v-model="state.isShowDialog" :before-close="closeDialog">
            <div v-if="imageSrc" style="display: flex; justify-content: space-between; align-items: center;">

                <!-- Display cropped image or original image if not cropped with background -->

                <div style="width: 50%; padding: 10px; background-color: #f5f5f5; display: flex; justify-content: center; align-items: center;">
                    <img ref="previewImage" :src="croppedImageSrc || imageSrc.toString()" alt="Preview Image" style="max-width: 100%; height: auto;"/>
                </div>

                <!-- Upload image section without background -->
                <div style="width: 50%; padding: 10px; display: flex; justify-content: center; align-items: center;">
                    <img ref="uploadImage" :src="imageSrc.toString()" alt="Source Image" style="max-width: 100%; height: auto;" />
                </div>
            </div>

            <!-- Centered buttons -->
            <div v-if="imageSrc" style="margin-top: 20px; text-align: center;">
                <el-button type="primary" @click="rotateLeft(-5)">左转</el-button>
                <el-button type="primary" @click="rotateRight(5)">右转</el-button>
                <el-button type="primary" @click="changeScale(0.1)">放大</el-button>
                <el-button type="primary" @click="changeScale(-0.1)">缩小</el-button>
                <el-button type="warning" @click="cropImage">裁剪图片</el-button>
                <el-button type="success" @click="uploadCroppedImage">确定上传</el-button>
            </div>
        </el-dialog>

    </div>
</template>

<script setup lang="ts" name="UploadImgs">
import {ref, computed, inject, watch, reactive, nextTick,onMounted} from 'vue'
import {Delete, Plus, UploadFilled, ZoomIn} from '@element-plus/icons-vue'
import { uploadImg } from '/@/api/system/upload'
import {UploadProps, UploadFile, UploadUserFile, UploadRequestOptions, ElMessage} from 'element-plus'
import { ElNotification, formContextKey, formItemContextKey } from 'element-plus'

interface UploadFileProps {
    fileList: UploadUserFile[]
    drag?: boolean // 是否支持拖拽上传 ==> 非必传（默认为 true）
    disabled?: boolean // 是否禁用上传组件 ==> 非必传（默认为 false）
    limit?: number
    fileSize?: number // 图片大小限制 ==> 非必传（默认为 5M）
    fileType?: any[] // 图片类型限制 ==> 非必传（默认为 ["image/jpeg", "image/png", "image/gif"]）
    height?: string // 组件高度 ==> 非必传（默认为 150px）
    width?: string // 组件宽度 ==> 非必传（默认为 150px）
    borderRadius?: string // 组件边框圆角 ==> 非必传（默认为 8px）
}
const props = defineProps( {
    modelValue: {
        type: String,
        default: ''
    },

    fileList: {
        type: Array<UploadUserFile>,
        default: () => []
    },
    // 是否支持拖拽上传 ==> 非必传（默认为 true）
    drag:{
        type:Boolean,
        default:true
    },
    // 是否禁用上传组件 ==> 非必传（默认为 false）
    disabled:{
        type:Boolean,
        default:false
    },
    limit:{
        type:Number,
        default:1
    },
    fileSize:{
        type:Number,
        default:5
    },
    fileType:{
        type: Array,
        default: () => ['image/jpeg', 'image/png', 'image/gif']
    },
    height:{
        type:String,
        default:'150px'
    },
    width:{
        type:String,
        default:'150px'
    },
    borderRadius:{
        type:String,
        default:'8px'
    },
    cropperWidth:{
        type:Number,
        default:400
    },
    cropperHeight:{
        type:Number,
        default:400
    },
})
const emit = defineEmits<{
    'update:modelValue': [value: string],
    'success': [value: any]
}>();
// 获取 el-form 组件上下文
const formContext = inject(formContextKey, void 0)
// 获取 el-form-item 组件上下文
const formItemContext = inject(formItemContextKey, void 0)
// 判断是否禁用上传和删除
const self_disabled = computed(() => {
    return props.disabled || formContext?.disabled
})
// 默认回显图片
const _fileList = ref<UploadUserFile[]>([])
// 在组件挂载后执行一些逻辑
onMounted(() => {
    _fileList.value.push({url:props.modelValue,name:props.modelValue.length+""})
    // 可以在这里执行初始化逻辑，比如获取数据等
});


watch(
    () => props.modelValue,
    (n: string) => {
        console.log('update:modelValue', n)
    }
)

/**
 * @description 文件上传之前判断
 * @param rawFile 选择的文件
 * */
const beforeUpload: UploadProps['beforeUpload'] = rawFile => {
    const imgSize = rawFile.size / 1024 / 1024 < props.fileSize
    const imgType = props.fileType.includes(rawFile.type)
    if (!imgType) {
        ElNotification({
            title: '温馨提示',
            message: '上传图片不符合所需的格式！',
            type: 'warning'
        })
    }
    if (!imgSize) {
        setTimeout(() => {
            ElNotification({
                title: '温馨提示',
                message: `上传图片大小不能超过 ${props.fileSize}M！`,
                type: 'warning'
            })
        }, 0)
    }
    return imgType && imgSize
}

/**
 * @description 图片上传
 * @param options upload 所有配置项
 * */
const handleHttpUpload = async (options: UploadRequestOptions) => {
    let formData = new FormData()
    formData.append('file', options.file)
    try {
        const { data } = await uploadImg(formData)
        options.onSuccess(data)
    } catch (error) {
        options.onError(error as any)
    }
}

/**
 * @description 图片上传成功
 * @param response 上传响应结果
 * @param uploadFile 上传的文件
 * */

const uploadSuccess = (response: { url: string } | undefined, uploadFile: UploadFile) => {
    if (!response) {
        return
    }
    uploadFile.url = response.url
    const imgs = _fileList.value.map(obj => obj.url).join(',');
    emit('update:modelValue', imgs)
    emit('success', imgs)
    // 调用 el-form 内部的校验方法（可自动校验）
    // 调用 el-form 内部的校验方法（可自动校验）
    formItemContext?.prop && formContext?.validateField([formItemContext.prop as string])
    ElNotification({
        title: '温馨提示',
        message: '图片上传成功！',
        type: 'success'
    })
}

/**
 * @description 删除图片
 * @param file 删除的文件
 * */
const handleRemove = (file: UploadFile) => {
    _fileList.value = _fileList.value.filter(item => item.url !== file.url || item.name !== file.name);
    const imgs = _fileList.value.map(obj => obj.url).join(',');
    emit('update:modelValue', imgs)
}

/**
 * @description 图片上传错误
 * */
const uploadError = () => {
    ElNotification({
        title: '温馨提示',
        message: '图片上传失败，请您重新上传！',
        type: 'error'
    })
}

/**
 * @description 文件数超出
 * */
const handleExceed = () => {
    ElNotification({
        title: '温馨提示',
        message: `当前最多只能上传 ${props.limit} 张图片，请移除后上传！`,
        type: 'warning'
    })
}

/**
 * @description 图片预览
 * @param file 预览的文件
 * */
const viewImageUrl = ref('')
const imgViewVisible = ref(false)
const handlePictureCardPreview: UploadProps['onPreview'] = file => {
    viewImageUrl.value = file.url!
    imgViewVisible.value = true
}

// ====================== 裁剪 ======================
import Cropper from 'cropperjs';
import 'cropperjs/dist/cropper.css';
const croppedImageSrc = ref(null);
const imageSrc = ref<string | ArrayBuffer | null>(null);
const uploadImage = ref(null);
const uid = ref(0);
// 自定义值
const state = reactive({
    dialogWidth: '800px',
    dialogTitle: "图片裁剪上传",
    isShowDialog: false,
    cropperImg: '',
    cropperImgBase64: '',
    cropper: '' as RefType,
});

/**
 * 打开 裁剪图片
 * @param file
 */
const openDialog = async (file: UploadFile) => {
    if (!file.url) return;
    uid.value=file.uid;
    imageSrc.value=file.url.toString();
    croppedImageSrc.value = null;
    state.dialogWidth="60%";
    state.isShowDialog = true;
    await nextTick();
    initCropper(file);
}

/**
 * 关闭 裁剪图片
 *
 */
const closeDialog = () => {
    state.isShowDialog = false;
}
/**
 * 裁剪初始化
 */
const initCropper = (file: UploadFile) => {
    if (state.cropper) {
        state.cropper.destroy();
    }
    if (!uploadImage.value) return;
    state.dialogWidth="60%";
    state.dialogTitle="图片采集上传( "+props.cropperWidth+" x "+props.cropperHeight+" )"
    state.cropper = new Cropper(uploadImage.value, {
        aspectRatio: props.cropperWidth / props.cropperHeight, // 设置裁剪框的宽高比
        viewMode: 1, // 限制裁剪框不超过画布大小
    });
};


/**
 * 修改图片大小 正数为变大 负数变小
 * @param num
 */
const changeScale = (num:number) => {
    num = num || 1
    state.cropper.zoom(num)
}
/**
 * 向左边旋转90度
 * @param num
 */
const rotateLeft = (num:number) => {
    num = num || 1
    state.cropper.rotate(num)
}
/**
 * 向右边旋转90度
 * @param num
 */
const rotateRight = (num:number) => {
    num = num || 1
    state.cropper.rotate(num)
}
/**
 * 裁剪图片
 */
const cropImage = () => {
    if (state.cropper) {
        const canvas = state.cropper.getCroppedCanvas({
            width: props.cropperWidth,
            height: props.cropperHeight,
        });
        // base64 格式
        croppedImageSrc.value = canvas.toDataURL('image/png');
    }
};
/**
 * 上传图片
 */
const uploadCroppedImage = async () => {
    if (!croppedImageSrc.value) {
        ElMessage.error('请先裁剪图片');
        return;
    }
    try {
        const blob = dataURLToBlob(croppedImageSrc.value);
        const formData = new FormData();
        formData.append('file', blob, 'avatar.png'); // 注意这里的表单字段名应为'file'
        await uploadImg(formData).then(response => {
            if (response.code === 200) {
                _fileList.value.forEach((item, index) => {
                    if (item.uid === uid.value) {
                        _fileList.value[index].url = response.data.url
                    }
                })
                const imgs = _fileList.value.map(obj => obj.url).join(',');
                emit('update:modelValue', imgs)
                ElMessage.success('上传成功');
                state.isShowDialog = false;
            } else {
                ElMessage.error(response.data.msg || '上传失败');
            }
        });
    } catch (error) {
        ElMessage.error('上传失败');
    }
};
const dataURLToBlob = (dataURL: any) => {
    const arr = dataURL.split(',');
    const mime = arr[0].match(/:(.*?);/)[1];
    const bstr = atob(arr[1]);
    let n = bstr.length;
    const u8arr = new Uint8Array(n);
    while (n--) {
        u8arr[n] = bstr.charCodeAt(n);
    }
    return new Blob([u8arr], {type: mime});
};
</script>

<style scoped lang="scss">
.is-error {
    .upload {
        :deep(.el-upload--picture-card),
        :deep(.el-upload-dragger) {
            border: 1px dashed var(--el-color-danger) !important;
            &:hover {
                border-color: var(--el-color-primary) !important;
            }
        }
    }
}
:deep(.disabled) {
    .el-upload--picture-card,
    .el-upload-dragger {
        cursor: not-allowed;
        background: var(--el-disabled-bg-color) !important;
        border: 1px dashed var(--el-border-color-darker);
        &:hover {
            border-color: var(--el-border-color-darker) !important;
        }
    }
}
.upload-box {
    .no-border {
        :deep(.el-upload--picture-card) {
            border: none !important;
        }
    }
    :deep(.upload) {
        .el-upload-dragger {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            height: 100%;
            padding: 0;
            overflow: hidden;
            border: 1px dashed var(--el-border-color-darker);
            border-radius: v-bind(borderRadius);
            &:hover {
                border: 1px dashed var(--el-color-primary);
            }
        }
        .el-upload-dragger.is-dragover {
            background-color: var(--el-color-primary-light-9);
            border: 2px dashed var(--el-color-primary) !important;
        }
        .el-upload-list__item,
        .el-upload--picture-card {
            width: v-bind(width);
            height: v-bind(height);
            background-color: transparent;
            border-radius: v-bind(borderRadius);
        }
        .upload-image {
            width: 100%;
            height: 100%;
            object-fit: contain;
        }
        .upload-handle {
            position: absolute;
            top: 0;
            right: 0;
            box-sizing: border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            height: 100%;
            cursor: pointer;
            background: rgb(0 0 0 / 60%);
            opacity: 0;
            transition: var(--el-transition-duration-fast);
            .handle-icon {
                display: flex;
                flex-direction: column;
                align-items: center;
                justify-content: center;
                padding: 0 6%;
                color: aliceblue;
                .el-icon {
                    margin-bottom: 15%;
                    font-size: 140%;
                }
                span {
                    font-size: 100%;
                }
            }
        }
        .el-upload-list__item {
            &:hover {
                .upload-handle {
                    opacity: 1;
                }
            }
        }
        .upload-empty {
            display: flex;
            flex-direction: column;
            align-items: center;
            font-size: 12px;
            line-height: 30px;
            color: var(--el-color-info);
            .el-icon {
                font-size: 28px;
                color: var(--el-text-color-secondary);
            }
        }
    }
    .el-upload__tip {
        line-height: 15px;
        text-align: center;
    }
}
</style>
